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    ELP303 Exp1

    Uploaded by

    Kushagra Mittal
    This document describes an experiment to determine the positive, negative, and zero-sequence reactances of a synchronous machine. The experiment involves performing open and short circuit tests on the machine to determine X1, and using two methods to determine X2 by applying negative voltage and a two-phase short circuit. X0 is determined by applying a zero-sequence voltage and measuring total current. Test results show X2 is 17.34 Ω by the first method and 12.98 Ω by the second, and X0 is 5.31 Ω. Safety precautions like not exceeding machine ratings and ensuring proper connections are noted.

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    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd

    ELP303 Exp1

    Uploaded by

    Kushagra Mittal
    12 views10 pages
    This document describes an experiment to determine the positive, negative, and zero-sequence reactances of a synchronous machine. The experiment involves performing open and short circuit tests on the machine to determine X1, and using two methods to determine X2 by applying negative voltage and a two-phase short circuit. X0 is determined by applying a zero-sequence voltage and measuring total current. Test results show X2 is 17.34 Ω by the first method and 12.98 Ω by the second, and X0 is 5.31 Ω. Safety precautions like not exceeding machine ratings and ensuring proper connections are noted.

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    Original Title

    ELP303_Exp1

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    This document describes an experiment to determine the positive, negative, and zero-sequence reactances of a synchronous machine. The experiment involves performing open and short circuit tests on the machine to determine X1, and using two methods to determine X2 by applying negative voltage and a two-phase short circuit. X0 is determined by applying a zero-sequence voltage and measuring total current. Test results show X2 is 17.34 Ω by the first method and 12.98 Ω by the second, and X0 is 5.31 Ω. Safety precautions like not exceeding machine ratings and ensuring proper connections are noted.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    12 views10 pages

    ELP303 Exp1

    Uploaded by

    Kushagra Mittal
    This document describes an experiment to determine the positive, negative, and zero-sequence reactances of a synchronous machine. The experiment involves performing open and short circuit tests on the machine to determine X1, and using two methods to determine X2 by applying negative voltage and a two-phase short circuit. X0 is determined by applying a zero-sequence voltage and measuring total current. Test results show X2 is 17.34 Ω by the first method and 12.98 Ω by the second, and X0 is 5.31 Ω. Safety precautions like not exceeding machine ratings and ensuring proper connections are noted.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    of 10

    ELP303 – Experiment 1

    Determination of Positive, Negative and


    Zero-Sequence Reactance of Synchronous
    Machine

    Members:
    1. Anand Rishikesh – 2019EE30554
    2. Pradyumn Singh Rahar – 2019EE30588
    3. Satvik Shubham Singh – 2019EE30598
    Aim:
    To determine experimentally positive, negative, and zero-sequence reactance
    of a synchronous machine.

    Apparatus Required:
    1. A three-phase alternator coupled to a D.C. motor
    2. AC Voltmeters
    3. AC/ DC Ammeters
    4. Tachometer
    5. Rheostat
    6. Three- phase variac
    7. Single-phase variac
    8. Clamp Multimeter

    Name plate of the machine


    Name: Benlec
    Rated output: 3kVA
    Voltage rating: 415V
    Current rating: 4.2A
    Number of Phases: 3
    Frequency: 50 Hz
    Circuit Diagrams:

    a. Open Circuit Test

    b. Short Circuit Test

    c. Determination of X 2 by application of negative voltage to alternator


    d. Determination of X 2 by two phase short circuit

    e. Determination of X 0

    Observations:
    Determination of X 1:
    a. Open circuit test
    Sl. No Ir V oc
    1 0.09 80
    2 0.13 120
    3 0.17 160
    4 0.21 200
    5 0.25 240
    6 0.31 280
    7 0.37 320
    8 0.47 360
    9 0.63 400
    10 0.71 416
    Voc vs Ir
    450
    400
    350
    300
    250
    Voc

    200
    150
    100
    50
    0
    Ir
    b. Short circuit test
    Sl. No Ir I sc
    1 0.08 1
    2 0.13 1.5
    3 0.19 2
    4 0.24 2.5
    5 0.29 3
    6 0.33 3.5
    7 0.38 4
    8 0.4 4.2

    Isc vs Ir
    4.5
    4
    3.5
    3
    2.5
    Isc

    2
    1.5
    1
    0.5
    0
    0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45
    Ir
    Determination of X 2 :
    a. Method 1
    Sl. No V2 I2 Z2 =V 2 /I 2
    1 15 1 15
    2 22 1.5 14.66667
    3 32 2 16
    4 41 2.5 16.4
    5 53 3 17.66667
    6 69 3.5 19.71429
    7 88 4 22

    V2 vs I2
    100
    90
    80
    70
    60
    50
    V2

    40
    30
    20
    10
    0
    0.5 1 1.5 2 2.5 3 3.5 4 4.5
    I2
    b. Method 2
    Sl. No V oc I sc Z2 =V 2 /( √ 3∗Isc)
    1 28.58 1.05 15.71538546
    2 36.15 1.5 13.91454965
    3 47.36 2 13.67205543
    4 55.52 2.5 12.8221709
    5 64.6 3 12.43264049
    6 73.2 3.5 12.0752227
    7 80.8 4 11.66281755
    8 84.2 4.2 11.57483779

    Voc vs Isc
    90
    80
    70
    60
    50
    Voc

    40
    30
    20
    10
    0
    0.5 1 1.5 2 2.5 3 3.5 4 4.5
    Isc
    Determination of X 0:
    Sl. No V0 I total I =I total /3
    1 2.56 1.5 0.5
    2 3.96 2.2 0.733333
    3 4.52 2.55 0.85
    4 5.32 2.95 0.983333
    5 6.03 3.4 1.133333
    6 7.44 4.2 1.4

    V0 vs I
    8
    7
    6
    5
    4
    Voc

    3
    2
    1
    0
    1 1.5 2 2.5 3 3.5 4 4.5
    I
    Results:
    Determination of X 2 :
    The negative-sequence impedance and reactance are:
    a. Method 1:
    V2
    Z2 = =17.34 Ω
    I2
    b. Method 2:
    V os
    Z2 = =12.98 Ω
    √3 I sc
    Determination of X 0:
    The zero-sequence reactance (Parallel Connection):
    V0
    X 0= =5.31 Ω
    I0
    3

    Precautions:
    • One must always take a note of the rated machine values and never exceed
    them while performing the experiment.
    • One must ensure that all the connections are tight and have been verified
    properly before powering on the circuit.
    • One must wear proper clothes, shoes and handle the electrical outlets with
    care

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